Leto

I've resorted to several strategies:

1) I buy vitamin B supplements for her (she calls them her happy pills during her less irrational periods) as they seem to work for the hormonal hell that she goes through

2) I've told her that I am a typical slow-to-figure-out-things male speciman. If she wants something done the way she wants, don't assume that I can read her mind. SPELL IT OUT FOR ME. I'll go to the ends of the earth to do something for her, but I will shut her out if she starts in on me for not figuring out what she wants. And in this I am only human, and have my mood swings as well.

3) Taking my younger brother's advice, I have plotted her period on calendar. Seriously. Information is a tool. Just like a guy can have mood swings based on hormonal flow, so can women in a big way. And I need to know when to expect her to be sensitive, so that I don't sulking around at her reactions.

Finally, what she wants more than anything is for me to try and be understanding when she's like this. She says that she doesn't like yelling any more than I do, but when she sees me "alking on eggsshells" it pisses her off. sometimes a hug is good, as is a cup of tea.

edit:

I just remembered: being on the birthcontrol pill can even out the ups and downs of the monthly cycle, but it tends to damped the libido as well. It's a give and take. Also, the pill is not recommended for women who are prone to breast cancer (my wife had it) as it is an estrogen based drug.